Transcript for Officers at U.S. Nuclear Facilities Falling Off the Job

story breaking overnight about troubling security lapses at u.S. Nuclear weapons facilities. New details coming to light about officers who hold those codes that can launch nuclear missiles. Falling asleep on the job, leaving doors open. Abc's martha raddatz joins us with the latest in a string of safety violations. A damning string at that, martha. Reporter: A string is right, josh. Close to 20 officers suspending for irning a "d" grade in safety inspections. In 2007, nuclear warheads were accidentally flown from one base to another. This morning, we are getting more details about this alarming failure to protect america's nuclear arsenal. Picture this, four air force officers who hold the launch keys to nuclear missiles, leaving open the glass doors that are supposed to prevent terrorists from entering the capsule. This while another slept inside, which is allowed only if the door is closed. Who discovered this? In one case, it was a maintenance team. In another case, it was someone delivering food. To make matters worse, when it was discovered, one crew commander asked a junior officer to lie about the incident. The junior officer initially went along with the lie but then backed off. Four missile officers have been given a letter of reprimand. A two forfeiture of pay. But these are career-ending letters and a huge embarrassment for the air force. And a measure of terrifying news. Martha, thank you for that.

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